Brendan Cox, the husband of the late Jo Cox who was killed by a far-right extremist, has spoken out after the terror attack on a mosque that killed one person and injured 10.
He said that Islamist terror and far-right extremism are "driven by the same hatred" in a series of tweets.
He wrote: "Far right fascists and Islamist terrorists are driven by same hatred of difference, same ideology of supremacy and use same tactics. We'll defeat both.
Far right facists&Islamist terrorists are driven by same hatred of difference, same ideology of supremacy&use same tactics.We'll defeat both— Brendan Cox (@MrBrendanCox) June 19, 2017
"When islamist terrorists attack we rightly seek out hate preachers who spur them on. We must do the same to those who peddle Islamophobia.
"Pathetic to see far right now try& portray their incitement to violence as simple commentary. You hear same excuses from islamist apologists".
A van was rammed into worshippers helping an elderly man who had collapsed in the early hours of Monday morning, before the driver is said to have screamed: "I'm going to kill all Muslims".
Speaking after a meeting with security officials and ministers in the Government's Cobra emergency committee, the Prime Minister confirmed that police believe the attacker who drove into people near Finsbury Park Mosque had acted alone.
The white van ploughed into pedestrians who were helping an elderly worshipper who had collapsed in an area that was busy with people who had attended Ramadan night prayers.
The pensioner they were helping later died. Police said he had already been receiving first aid from members of the public and it is not yet known if his death was caused by the attack.
A 48-year-old man has been arrested on suspicion of attempted murder over the incident in Seven Sisters Road. Ben Wallace, the security minister, said the suspect was not known to the security services.